Bosch INTEGRUS Specifications download pdf (Page 9)

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System Description and Planning | 5

System Description and Planning

Introduction

System overview

Integrus is a system for wireless distribution of audio signals

via infra-red radiation. It can be used in a simultaneous

interpretation system for international conferences where

multiple languages are used. To enable all participants to

understand the proceedings, interpreters simultaneously

translate the speaker’s language as required. These

interpretations are distributed throughout the conference

venue, and delegates select the language of their choice and

listen to it through headphones.

The Integrus system can also be used for music distribution

(mono as well as stereo).

Figure 1: Integrus system overview (with DCN system as input)

The Integrus Digital Infra-red Language Distribution System

comprises one or more of the following:

Infra-red transmitter

The transmitter is the core of the Integrus system. Four

types are available:

• INT-TX04 with inputs for 4 audio channels

• INT-TX08 with inputs for 8 audio channels

• INT-TX16 with inputs for 16 audio channels

• INT-TX32 with inputs for 32 audio channels

Interface module

An LBB 3422/20 Symmetrical Audio Input and Interpreter

Module to connect to analogue discussion and conference

systems (such as CCS 800), or to LBB 3222/04 6-channel

interpreters desks.

Infra-red radiators

Three types of radiators available:

• LBB 3410/05 wide beam radiator for small conference

venues

• LBB 4511/00 medium-power radiator for small / medium

conference venues

• LBB 4512/00 high-power radiator for medium/large

conference venues

All three types can be switched between full and half power

use. They can be mounted on walls, ceilings or floor stands.

Infra-red receivers

Three multi-channel infra-red receivers are available:

• LBB 4540/04 for 4 audio channels

• LBB 4540/08 for 8 audio channels

• LBB 4540/32 for 32 audio channels

They can operate with a rechargeable NiMH battery pack or

with disposable batteries. Charging circuitry is incorporated

in the receiver.

Charging equipment

Equipment is available for charging and storing 56 infra-red

receivers. It is available for portable or fixed-installation

applications.

System technology

IR radiation

The Integrus system is based on transmission by modulated

infra-red radiation. Infra-red radiation forms part of the

electro-magnetic spectrum, which is composed of visible

light, radio waves and other types of radiation. It has a

wavelength just above that of visible light. Like visible light,

it is reflected from hard surfaces, yet passes through

translucent materials such as glass. The infra-red radiation

spectrum in relation to other relevant spectra is shown in

figure 2

Figure 2: Infra-red radiation spectrum in relation to other spectra

(1) Daylight spectrum

(2) Sensitivity of the human eye

(3) IR radiator

(4) Sensitivity of the IR sensor

(5) Sensitivity of the IR sensor with daylight filter

Signal Processing

The Integrus system uses high frequency carrier signals

(typically 2 to 8 MHz) to prevent interference problems with

modern light sources (see section ‘Ambient Lighting’). The

digital audio processing guarantees a constant high audio

quality.

The signal processing in the transmitter consists of the

following main steps (see figure 3):

1. A/D conversion -Each analogue audio channel is

converted to a digital signal.

2. Compression - The digital signals are compressed to

increase the amount of information that can be

distributed on each carrier. The compression factor is

also related to the required audio quality.

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Bosch INTEGRUS Specifications Page 9

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